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Engine misfiring

Tiny
MECANICO3
  • MEMBER
  • 2014 TOYOTA SIENNA
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Is there a certain way to calibrate electronic throttle body assembly? It's on intake manifold driver side.
Sunday, July 12th, 2020 AT 5:37 AM

39 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I attached the initialization of the throttle body for you.

https://www.2carpros.com/articles/how-a-throttle-body-works

Are there any issues that lead you to do this procedure?

https://www.2carpros.com/articles/throttle-actuator-service

Roy

PERFORM INITIALIZATION
NOTICE:

Be sure to perform this procedure after reassembling the throttle body or removing and reinstalling any throttle body component.
Perform the following procedure after replacing the ECM, throttle body assembly or any throttle body components. The following procedure should also be performed if the throttle body is cleaned.
Be sure to perform this procedure after replacing the ECM and reconnecting the battery cable.
Disconnect the cable from the negative (-) battery terminal. Wait at least 60 seconds and reconnect the cable.
Turn the ignition switch to ON without operating the accelerator pedal.
NOTICE:

If the accelerator pedal is operated, perform the above steps again.

Connect the Techstream to the DLC3 and clear the DTCs . [ 2GR-FE ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR ]
Start the engine and check that the MIL is not illuminated and that the idle speed is within the specified range when the A/C is switched off after the engine is warmed up.
Standard:

Condition Engine Idle Speed
A/C switched off 600 to 700 rpm

NOTICE:

Be sure to perform this step with all accessories off.
Make sure that the shift lever is in neutral.
Enter the following menus: Powertrain/ Engine / Data List/ Throttle Sensor Position. Fully depress the accelerator pedal and check that the value is 60% or more.
Perform a road test and confirm that there are no abnormalities.
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Sunday, July 12th, 2020 AT 5:56 AM
Tiny
MECANICO3
  • MEMBER
  • 31 POSTS
Also need ignition coils wiring diagram. Getting weak spark on cylinder 1 and 3. Any help would be great. Thanks!
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Thursday, July 16th, 2020 AT 3:42 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I attached the wiring diagram for you of the ignition system.

https://www.2carpros.com/articles/how-to-check-wiring

Do you have any codes set in the system? If so, can you give those codes so I can help narrow the area of failure.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

You will have a battery feed with the key on to the coil. Then the ECM will command it to fire based on the position of the crank sensor.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

Roy
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Thursday, July 16th, 2020 AT 4:12 AM
Tiny
MECANICO3
  • MEMBER
  • 31 POSTS
Still getting codes p0301, p0303 and p0305. After installing new spark plugs, checked coils, injectors and vacuum. But there is some noise coming from that Head Cylinder.
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Friday, July 17th, 2020 AT 3:45 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I wish you would have told me about these codes in the beginning.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

I would start with a compression test to verify no internal engine issues.

https://www.2carpros.com/articles/how-to-test-engine-compression

The most common failure for the 300 code is fuel pressure you need to test the fuel pressure to be sure there is sufficient pressure to the injectors.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Friday, July 17th, 2020 AT 4:06 AM
Tiny
MECANICO3
  • MEMBER
  • 31 POSTS
Will lack of fuel pressure cause noise in head cylinder? But will do compression test after work. Plus I think I need adapter for fuel check.
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Friday, July 17th, 2020 AT 6:53 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Can you upload a video of the noise from the head?

Keep me updated.

Roy
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Friday, July 17th, 2020 AT 6:56 AM
Tiny
MECANICO3
  • MEMBER
  • 31 POSTS
Turned out to be no compression on cylinder on #1 (valve spring broken). Waiting on special socket for head cylinder bolts to arrive. Can you provide timing procedure on on chains? Thanks very much in advance !
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Tuesday, July 28th, 2020 AT 5:02 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Wednesday, July 29th, 2020 AT 4:48 AM
Tiny
ANGELOIACONO
  • MEMBER
  • 4 POSTS
  • 2008 TOYOTA SIENNA
  • 79,000 MILES
2008 Toyota Sienna - garage could not get it to repeat and said it was water in the fuel line.

My wife was driving her 2008 Toyota Sienna down the highway yesterday. She was about 40 minutes into the trip, when the Check Engine light started to flash, about 20 seconds later, the VSC light went on and the car was shaking uncontrollably. She pulled off and I went to check the car. I started it and took it to a local garage. They pulled the codes and said that it had all 6 cylinders misfire and it had overheated.

The shop tried all day to recreate the issue and it never did. I drove it back from the shop (Another hour or so with traffic with no issues). Can anyone explain what that issue is and how I can avoid issues with this in the future. The garage said it may have been "Water in the fuel line" but I want to be sure. Thank you.
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I have never seen water in the fuel to cause over heating.I have seen missfires engine justs dies and wont start etc but not overheating. Why did they say it overheated?
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
ANGELOIACONO
  • MEMBER
  • 4 POSTS
He gave no reason for the overheat and said it may have been an old code, as I have never seen it overheat. My main concern is the misfiring cylinders and the lack of "cause", as my wife tends to take long trips alone and I bought this van because of reliability.
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Those wouldnt be old codes because when the check engine light flashes that means there is a major missfire that can damage the cat. So is there a list of the codes it had the exact code numbers not code descriptions?So it hasnt happened since?Also how many miles ago did it happen?It wouldnt hurt to get a good fuel drier and add that to the tank.I have seen water in the gas cause very phatom running issues.
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
ANGELOIACONO
  • MEMBER
  • 4 POSTS
It was likely 60 miles ago. And not has not happened again and hopefully never again. The mechanic did say when he was inspecting the engine at first that, I believe it was an ignition wire was "loose" and he pushed it down so it had a better connection, could this have caused the 6 cylinder misfire?
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
That has one coil for each spark plug with a connector going to it. So I dont see how one could set codes for every cylinder missfiring.I would get some good fuel drier I recommend the bg products brand I have used it in the past. It works very good you can find it on ebay or call around to shops and see if they carry bg products. Iam not sure what happened I wasnt there to see it after it happened see the actual codes etc. So did it act up for the people that looked at the car?
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
WOLFPAIN
  • MEMBER
  • 1 POST
  • 2001 TOYOTA SIENNA
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Recently replaced knock sensor, now I'm getting multiple misfire as well as misfire in number 6. I'm at a loss, any idea what would cause it aside from obvious? I already tried obvious fixes.
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
ANGELOIACONO
  • MEMBER
  • 4 POSTS
It never acted up again for the people who tried identifying the issue, the codes were P0300 P0301 P0302 P0303 P0304 P0305 P0306, I don't have the overheat code.
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

What is the obvious repairs you did?

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

The first thing I would do is a fuel pressure test to be sure there is sufficient fuel to the injectors.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I would also do a compression test on at least the cylinder listed to be sure there is no internal issues with the motor.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I would try the fuel drier fuel would effect all the cylinders and could be very sparatic.
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)
Tiny
2008SIENNA
  • MEMBER
  • 1 POST
My wife just had the same problem with her 2008Sienna. Filled tank with gas and drove it 60 miles on highway and had identical situation. She had it towed to a Toyota dealer in Superior who said all codes showed misfire but they could not replicate problem. His guess was bad gas. Have now driven it another 50+ miles and no problem. Is this a common sienna problem? Is it safe to drive?
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Wednesday, July 29th, 2020 AT 5:45 PM (Merged)

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